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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db19ef660af8392b5d4de48a48d9d4f81302d78d3e76f2eda83bead922a75d1' 
  AND token = 'oAQN94loHV495GS+QOzUxR5sKliBo5/2SmJ++AziKoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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