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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5b3d91fa8c7d3c541768d7c9012e331be45dd5ea54cbe670d386b984149fb3' 
  AND token = 'xiHp0qPD1ba6Hv1+8+QxLZtpxH2/aYUe3KSK76B1I9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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