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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcb23b2e6fbc3a6d65a5ea15ac823a6334765fa30172d0ecddbe9aae8041d7b' 
  AND token = '9biNVsOWmDeICH8RnCLzAr0JFqZ6xhSLVdXYFeiKbd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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