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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99bcdbf44a6b00d9dc1e7a18b36b0540d34e11069ee98cb7f53f832c0f022749' 
  AND token = 'zFhjMYWVYut9SK6kso1qAo1NmJjPVNACqF0wR8fLS2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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