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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6eefbe4b30ff314a30268dbf88180dfe6bb13f9b036cf8bb4d407e3909bff71' 
  AND token = 'pN26TJ1hczqjYapb3P3R7ocG7bCp9TEJTI1NS0hqbaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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