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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a3fccd885781ab4c1318dc548e41154ad4b858ce29307f52050f2feb44bcfe' 
  AND token = 'ul/r50CmWrfW0AB6AIIHs0+pn7GOYTQuvqF/2b6Sn8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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