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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c3fdc707d85f7099c6838b75768bbb9325a549c206c22d8892d2213f5013b1' 
  AND token = 'QCQvPKqKLMb0qxyiz1iAOpHyNBdbddlkuvkV+VOCrJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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