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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac73fd059f8358caf99d9dc498ef53193da85fa855e9a7ed5332e3e2297d2818' 
  AND token = 'AUT8Gldwx64EBv2zstCEdHgjz2dXXHpTAz18imNWJAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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