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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956e953f590bc44ad62c2a04cd65f9ad68dad3d7f104279d3f7ce9670efcdbeb' 
  AND token = '2ANwz0QPD1Gq7iuYvbhtPzZvRNt/k0GW8UuGsxQ8EZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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