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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6367f51ebfcf65aa1d4f566e0aa5d2d1f0482e03ce6f0b3db8edc9c43cc4a05d' 
  AND token = 'X0dfRTI2+5++hHtAv04JpQRTHawZPLTMqtqF5356bBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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