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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b73523128803458f9a6f257c2e056b7e60f2fe1a8cc58b3bbc8aedf7083c6a' 
  AND token = 'zDdN1mRzPh/V5Jf52qSnoo0MsM/AUgGTME0skCYn7PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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