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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325dd8f88e8c9dfe44f3991085d52d1ca7e76a311d237cb2029ec8837cd5d0d3' 
  AND token = 'IM76I0LQI84ma9A8mQJJYZSwB8JBIWDbPeamHvMht4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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