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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39de464ef2c9886d6aeed8d2b0b532bede1aad427d15f22ef3d65e2fa3af588d' 
  AND token = 'QLE36MVgWe7g/Pf1Rbv1/wFX0F1Ut9QtlCALO8nZ2dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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