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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd11ad33e0b6f7b524b2bd6bf5d79b5ed01cd92a985ec0ff61b14f5e1387b9bd' 
  AND token = '4slIt6IkQ/GM+uWd2NXglqWFSvS7aq8bdm8BFNBWJic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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