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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4e16890c30e771e01ad5e49efe1eb0e8c9a751634f77b9319fa38d11b8dd12' 
  AND token = 'vdhkPKqOXUve0ZwaAoW7ZocnAI0qpc0RM5Hkze7YWck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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