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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ff3457c4ee30dfe1687f694a5776d6d42ad34a75687ec821f46096718b03eb' 
  AND token = 'IY9W3Dwx2MkQBlqBKU0tzAP5EuCzSX6IJNtoagrRCQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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