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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2875cf44de05011f7a8cef5b53d2472f7527af76f90d75292bfe3c9f87364160' 
  AND token = '71Gd3SP8fDvBXPh5gTvDBRuSFB6dKq7ONs2qg/LTOis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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