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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803c297f8cb098a37e7e2508987d2597bf96e7395b5344d908500aada40fb9a9' 
  AND token = 'dzTOrGGrLRW/PBcCR2edE6FAHzoWCoPuFR3jS8PibJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}