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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9d19bdc3fc4afca2f4683edb4c17c39ea92e63e9e0f7af84d4017a0a29666d' 
  AND token = 'eLd9Tr6HnR0E0bGl1Tuy+HkmCJuz6fbuy47sqShj0tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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