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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae88d4356810177d42d2c18394eb43535b0b829f95afea89db1cb9c6d6d2973' 
  AND token = 'mxlEDtB+edoPIoSBzKvzlzYZ08UN1DlTIQ0r+ds6lD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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