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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a836f2daee77a62922468e490366ca94ac84e0389909c3e4a5d9c665b5dad5' 
  AND token = 'yf2nhEe59S0TBL8nkxySHDohxfbL0pVUmPUTWTWU8OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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