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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020b48772c3ef08416e2b2446458d8bdc94ace5a5f0b6c4261efd8d954d1df5d' 
  AND token = '2py6ZIyt5/D9l7dpSLaDiYeFGyAnfrPL/wbZLFeSMuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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