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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe633972a74273ca58bfa226ea009f98c94a616402cdb6bdcbc517aa68ae4b9a' 
  AND token = '4dM0RZiEzwahusmqvsSCVialMxeH6svw5dlGiHiFzeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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