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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020972d71210effa616f9b03b6ae9afb0d876405d6cd5d117a78cdc0f2db2eee' 
  AND token = 'g3IQ5U7qCwWkJLv3vb2CFWLW4MywNtMjNZ+3BPdfW6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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