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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a174dccd0a389a4e28726372a58c3341ad4e47a724fc97526358b463c13e23f0' 
  AND token = 'yct0lGAY4Dilq+yENcK1zpeM4spFI6U35lyA4A6KMXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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