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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44bd0d0d393368502a98537af6da87f2feb851f6eea1ef466e1cb5276a65230' 
  AND token = 'TLaJ6Ksr36Jl7SNjrtrH67GYXwlc8VxjbvgVN8hIkho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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