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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0da188ad82175f1aee4f78f76b735d167c5f0d9ae76d8f021c5bbab092dcb1' 
  AND token = '7nrylbyVe5MRrcxrDSBvKqXbkcX975+RCBmKiV6iOCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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