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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c242bb549930a9936b660b5d2b8aba3687fdaefa14eed448cee848b760b9cb' 
  AND token = '/8bW8t4T6zr5f89/1rIaGbSrzFE/Ml4htTiR0RLhDv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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