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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '437bb9dc2fbd6cb0cf8ae0d0cda8b3d4e0bf80d32ed189b615551c837db2b6dc' 
  AND token = 'iljGCXNOoKClQqlOYDXWU4/p74owjo87s03UpuPdCp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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