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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c6c3dd655ee9204bf9b2e51e18ab18f6f4bfe538e244d81c3f47d39f77cd64' 
  AND token = 'sUzyhXtTcKXET+uC9rT0tNV5Vh4+ZiIQOI5w8a2wqLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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