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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb384d2600000532e9a3114a3df60fafeb3731d0409dbc6429f13a7d1b3c8536' 
  AND token = 'CGcPPO8S9l7Ar+VJk5ZDHIDwQ5PXLNTucOkb5HMfNxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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