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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0315702dd01c65ac6eda0c6189510f8a257405b19de054480c22e1635c28a3c0' 
  AND token = 'wRpQKfjr6X0yvy3ch3/wZ+HRnoIbGNHNUV0u9QXGIyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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