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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193cfb7694e15244214c16dfc9b4e0ab6434175c8fe4a78d8a9eb8ddc7111313' 
  AND token = 'UUA7vDqFdldEQ+E/bhK3/vp9xhVpc53uFwRfWhQN1Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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