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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cbabd3534bf307851b2e3864220d153760da852c610b40f386fa8fa14e330c' 
  AND token = 'vd64iE/5cvaMKmInmceHyD8gGq+C6jBVwe5VVbS50d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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