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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b32ec3fba89d9919d20011013a0ccf571ae37ba75da821e26a852cd13d44f5' 
  AND token = 'fNZZeC7HI9VkXt8TF72zsGd1IVJX33t02os07NdszcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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