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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befcd175edf8b99312266e6262d1fa45a2f881d532d1a6b8afa0e6f91d1a0c80' 
  AND token = 'WgZpqJ7AX7B4khnvUb+9DsoWAYPinaIbEpjsORe6qOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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