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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b97f14321c6818164ba262132dc5b1778b66b242ded77a80105488044cc04ec' 
  AND token = '0MP/4oGedLKKQwhjgqCinv3O5ZiG4n2unh8RylkS8Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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