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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41884ac56f48e7a388400082956587e8ffeee0ecc025fa240206074c49129e12' 
  AND token = 'JXIdV84Lckme+rLUdtcNbBk0QM4xwE/lCpWJYyR8KHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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