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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ec602edcefd7da758cc65d191e5f985ea3c33b4586708a090853ed1fba6abb' 
  AND token = 'Wwtcr7fYaCRP9WiCgdC9JLzGYk4tzetv8h9E23ibbYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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