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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6bd83430e0b875529b792a5185958fc4fbd5dfa4ae08e56cc3dd384cffee372' 
  AND token = 'jdeVdAy5h20B0zVHtod4aKcesMT7pCO6wnkzSQOWIZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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