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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4704ea47f6258349610c72789d80ed19707a201f3e60b67bcfa92bc037f5eea' 
  AND token = 'yIgXcuQpkmb2eExDswTz7JN3RRcv3dchokSWycQ0uWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00151

JSON explain

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