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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aeb2f53dbde9b99e72f0d894c47f9bd21213221cd1b6352057ee6a90a5f5b34' 
  AND token = 'j0AS1BnWouOKsK45T6gSUudJAhgedqwFIoC3TcKbKrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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