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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03594fb329e1b55fe7abd2e0e5eaa6b7188f7ebc352bf6d425d9379b6ae7b4b' 
  AND token = 'SQGGmWrnDyJMG2P1AMHFl/UOiRnQa5tt3ozey4uYzYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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