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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf65a4df4937d6bb60d95cb9b72e010edd8d826bf0bbb0754af8d74cb01266b0' 
  AND token = 'G84RKKmFNOrUtVgIPz9dk4j2ssDvEiQEX4hwlac4FIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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