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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b1eb7e421998270287336b9980d581037da00ecbc3a2eabe9ef2893dea0aab' 
  AND token = 'UR4eptlrVj87FyfzS8zBcSzyRQnLDZl3SLro7GUAWAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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