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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56312f8a10a003e3cbdfd8a0104e7f86f06c9dc6b1ba5cee3278cc814bb942c7' 
  AND token = 'V3nIOv9rt1gFJctg9IUUZ2B4t16X62dHOzg6q+H/s1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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