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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5083bd3e119300c8eadcd4ef5128e85b616dc1d80e858fdd4d0920618af3ca47' 
  AND token = 'ByU1OZFT8GieKPNtZXZXw7/74rZ+Z70CM43DACRWHNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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