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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb40056e72922387543c5a80a0fadae5da7209019656fb3f7a2b53f669dd5d0' 
  AND token = '8yVi/C+qO6l8X4jGCULTfw3OknmsotI0lx81MYnkrGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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