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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63083692d0bd4a7df1936a3f7f4ee9e3c3debcb577447e0fcdbcd28b815d7fd4' 
  AND token = 'mX06jNOaGgvJnaOimZ0U1e68wPyw25r7vyfdvyysQrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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