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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53871f7ac780ababa54e6e518d7ccd8c30e59c9bff3db74fcccc0c816db0941' 
  AND token = 'aHZEA0NYrPn5LxsrykXZHQBcj022va8Gu6bgJx3g1eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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