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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9152d4d2075f7b9e83bfbabaff83986dabf0671f202e1b466b2ed75e6a040b50' 
  AND token = 'G1vOppT5t6dIXOawEQg0tJ5teC95DhhtfAcGzf3qiP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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