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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cfdedc087c6297f3d3794e6c2f41226409c8ef431520935fa31020236ea73a0' 
  AND token = '2NIwKygJYybJQVQMXBB/SKmBRy6WkUL05Yb3DYqVYyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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