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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195f2b60908274077fe8eefd056a7f2b6cc618df8bab91109bb3c3c1f1da6831' 
  AND token = 'u6Ngx7NU7M6C2PNmGC7a6FT299We3LK07HVNGx9myNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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