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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a9d7ad5897b8b19e066e3c2712f6a32aca684bc31934e1defc71980109d8e5' 
  AND token = '9q3H3WNf/um18DfLSBJMN8Jxdjm3tt6241yuM6h729Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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