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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be36c9c59556173ca5d9f0ccdaa3bba51e0a7ef319016478b2c916ea2f5cd16c' 
  AND token = 'ylHeKXsmYlAOGR71U2A3mRiipMTkOw5w9n02gXUGhKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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