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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298cdda83986fa4ce72191503ac012779b328e769109276f49b29a1bf651169d' 
  AND token = 't7TuvSHZES7X6zU6nTRhM5LJh5xYx8DfWw22EXgG4Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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