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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d1526b12dae18afb14daf5edcd1abae637593236ba2627397d3553d7ea4e33' 
  AND token = 'KBY5h2c1oH0B84aNtw2XJB4jj8YvMxN2r2xnGQHTZF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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