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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89352d92b46f6e95f5734ec357514d3b111aa729a9694b5a58d4a2d0c875ec29' 
  AND token = '4aUWMG2HUxMlE4gX7lqoppp17lNCmYr6nSPq2z3ZVtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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