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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f5b4c1f5d3af731088d42b16c5a73c639969806e9f639ff062004db80808b61' 
  AND token = 'fsTsU9CTgfGSvB1ARH06fplecifs817JHaNJ7SHNDCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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