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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bb2b65fb96cf735330b65c195ae723216efa01d6c5e112f50bf2c9e4921722' 
  AND token = 'EiZQEOV1ZzT7rI4PmBaEuE8/ANiVHbSlEUO0gbeRNbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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